Apparatus for recording and/or reproducing information and/or from optical information record disk

Abstract

An apparatus for recording and/or reproducing information on and/or from a magneto-optical disk including an optical head for projecting a laser beam onto a magneto-optical disk and receiving the laser beam reflected by the disk, an up-down block arranged movably between a lower position and an upper position, an up-down motor for moving said up-down block up and down, a turntable for supporting the disk and a spindle motor secured to said up-down block and having a driving shaft coupled with said turntable for rotating the turntable, a position detecting device for detecting a position of said up-down block to derive a position signal when the up-down block is driven into the upper position, a rotation detecting device for detecting a rotation of said optical information record disk to derive a rotation signal when the optical information record disk is rotated at a predetermined revolving speed, and a control device for initiating a focus control for moving said objective lens and turntable relative to each other in accordance with said position signal and rotation signal.

What is claimed is:  
     
       1. An apparatus for at least reproducing information from an optical record disk installed within a disk cartridge having an outer surface in which at one depression is formed, said apparatus comprising: 
       a cartridge holder for holding the disk cartridge;  
       a movable member arranged to be movable in a first direction toward or away from a record surface of said optical record disk;  
       a spindle motor secured to said movable member and detachably coupled with said optical record disk within the disk cartridge to rotate the optical record disk;  
       at least one positioning pin secured to said movable member and being insertable into said depression formed in the outer surface of the disk cartridge;  
       a transmission member for moving said movable member in said first direction into a given position in which said spindle motor has been engaged with said optical record disk;  
       a control means for detecting a condition that said movable member has been driven into said given position, and for driving said spindle motor after a detection of the condition; and  
       a resilient member for resiliently urging a part of said movable member in said first direction against said transmission member by a force produced by a recovering force of the resilient member under such a condition that said spindle motor has been engaged with said optical record disk.  
     
     
       2. An apparatus according to claim  1 , wherein said transmission member comprises a gear. 
     
     
       3. An apparatus according to claim  1 , wherein said transmission member comprises a supporting plate. 
     
     
       4. An apparatus according to claim  1 , wherein said movable member comprises an up-down block. 
     
     
       5. An apparatus according to claim  1 , wherein said movable member comprises a supporting plate. 
     
     
       6. an apparatus according to claim  1 , wherein said resilient member is formed by a coil spring. 
     
     
       7. An apparatus according to claim  1 , wherein said transmission member includes a plurality of shafts extending in parallel with said first direction. 
     
     
       8. An apparatus according to claim  1 , wherein said positioning pin extends in said first direction and has a tapered tip.